10a11,13
> #define print_link(f,u,v) if(u < v) fprintf(f, "%ld %ld\n", u, v)
> #define print_degree(f,i,d) fprintf(f, "%ld %ld\n", i, d)
> 
12c15,20
< int graph_to_file(FILE *f, GRAPH *G);
---
> void read_degrees(FILE *, GRAPH *);
> void print_degrees(GRAPH *);
> /* int find_degree(GRAPH *); */
> int graph_to_file(FILE *, GRAPH *);
> 
> int subgraph_to_file(FILE *, GRAPH *, long *nodes, long nbnodes);
